"The bottom line is there's no need for censorship."
You may as well say we do not need laws by the exact same formula: "If a school of thought or action is reprehensible than you should teach your children that and have your friends teach their children that and if society is really against the reprehensible thought or action it will be discredited"
There are some things which are really, really bad, like conspiracy to overthrow the state. This is not an action, this is thoughts, plans, goals. It involves freedom of speech, one should be free to write a treaty on how to overthrow queen and parliament. Yet, in most peoples book, this is the highest crime on the land.
It is quite noble to suggest that we live in a perfect society where bad people do not exist. Speech is a powerful thing that is why it is protected by your constitution. Its power however is not necessarily always used for good.
The example of Socrates that you used is a good example to illustrate my point, it is the government using censorship to guard its own power, it is the old bureaucrats telling the teenagers what the good life is. As I said I am a libertarian, I do not believe the government should go an inch further than protect us and our property from other people.
I do not think that I could go so far and say that a group of people can not protest however - I do not quite know the facebook issue. If the media suggests that something should be banned, say the burka, because it is used to enslave women, because it keeps our society divided, etcetera, I think they have the right to so shape the opinion of the people so as to regard the burka as socially unacceptable.
I think I have entered a complex line of thought, mostly because I am speaking of generalities when such issues are particularities. I may conclude with saying that parliament has no business to censor due to its heavy hand and leaves no room for manoeuvre, but society does, because this is the best way to protect the rights of those in the minority of certain thinkings as they will be given the option to fight through their speech for whatever issue and if they manage to win society over fine.
I can use two examples to illustrate my point. In the 1960s it was society which began to see homosexuality as acceptable, this change of thinking on societies part was to some extent led by the media. Government soon followed with legalising homosexuality.
Smoking in public places is banned in the UK. The media played some good part in shaping the public's opinion. Now, although smoking is not fully banned, it is a very unsociable act. This is society in action, pressuring its members into conforming. In my opinion parliament can give it a last push and take the smokers out of misery by banning smoking completely. Yet this is protecting individuals from harming themselves and while it may benefit a great many, there will be a minority which such action would take away their liberty. Hence I think it is best to allow society to do what it does best, make it easier for those who smoke to stop doing so by making such behaviour socially unacceptable.
Does society have a right to pressure its members into accepting the holocaust? Of course. Does government have the right to ban the denial of holocaust. Absolutely not. Why? Because history tells us over and over again that some times we are told things which might actually not be true, such as the world is at the centre of the universe, that some god exists. It is of course ridiculous to suggest that the holocaust did not happen and every right minded person, which includes most of our society accepts it. If therefore facebook is propagating some misinformation to suggest that holocoust did not happen, the members of society have every right to protest, influence, pressurise it, etcetera, to conform. But facebook has still the right to continue propagating such misinformation. You see, if a person had some row data to back up such claim, and if they believed enough in their cause, then they would be able to withstand such pressure and continue with propagating whatever they are and at the end of it the world may end up better off. If the government however had legislated that the denial of the holocaust is illegal, this person would be stopped in its tracks before he began. And I think that is the crux of why I believe that government has no business in censoring, but society does.
P.S. I have used the holocaust only as an example, all the above are fictional scenarios used only to illustrate a point and not to imply anything.